Tire valve



Mar. 3; 1925.

H. P. KRAFT TIRE VALVE Filed March so, 1922 HINVENTOR By Attorneys,

Patented Mar. 3, 1925.

UNITED STATES Free.

HENRY PHILLIP KRAFT, O'F RIDGEW'OOJ, NEE/V JERSEY, ASSIGNOR TO A. SCHRADER$ SON, INCORPORATED, OF BROOKLYN, NEVJ YO K, A CORPORATION OF NEW YORK.

TIRE VALVE.

Application filed March 30, 1922.

To all "(ohm/t it may concern:

Be it known that I, HENRY Prrnzmr KRAF a citizen of the United States of rtmerica, residing in Ridgewood, in the county of Bergen and State of New Jersey,

have invented certain new and useful lmprovements in Tire Valves, of which the following is a specification.

This invention relates to valve casings for pneumatic tires or the like, although it is applicable to the other devices of a. like nature.

It has heretofore been proposed to construct valve casings for pneumatic tires by the die casting process, but in the com-- mercial use of such processes it has been found to be impracticable to use a. metal which has the necessary strength of const-ruction to resist the hard usage to which a valve casing is put. It will be understood that in the conventional type of pneumatic tire valve a foot is provided at the lower end of the casing which is adapted to be inserted through a hole in the inner tube, and a socalled ring washer is also provided on the casing which bears against the outer side of the inner tube, the ring washer being forced toward the surface of the tube by a nut which clamps the tube between the foot and washer. Commonly a spreader is interposed between the ring washer and nut. The hole through the inner tube isusually smaller than the diameter of the body part of the valve, and the latter is provided. with a circumferential groove just above the foot into which groove the edges of the hole in the tube fit. This groove or neck in the valve reduces the thickness of metal at such point, and the pressure occasioned by setting up the clamping nut induces an unusual strain at this neck portion. Furthermore, in ac tual use the tendency of the outer casing or shoe of the tire to creep is resisted practically entirely by the valve casing acting through the spreader. This also sets up a very considerable strain at the lower part of the valve casing, both at the neck, just referred to, and somewhat above it. These strains are not capable of being met by the metals which are customarily employed in die casting, and this has rendered the die casting process inapplicable to the construction of such valves.

According to the present invention which Serial No. 547,950.

is an improvement over that disclosed in my (to-pending. application, Serial No. 524,388, filed December 28, 1921, I provide a construction of valve casing, having a reinforcing flanged sleeve, the sleeve extending upwardly into the casing to a point preferably well above the neck, and the flange lying against the top of the foot por tion of the casing. The sleeve portion is preferably provided on its exterior sin-face with ridges or corrugations or roughened in any other manner in order to provide a suitable holding engagement between the reinforcing member and the casing. By this means the valve casing is adequately reinforced at its point of greatest weakness and greatest strain so that meta-ls having a low tensile strength can be employed in its construction.

The preferred construction of the present invention is illustrated in the accompany ing drawings wherein.

Figure 1 is a longitudinal section partly in elevation of a valve casing embodying my invention.

Fig. 2 is a transverse section taken on the line 22 of Fig. 1.

Fig. 3 is a side elevation of the reinf0rcing member.

Fig. 4 is a top plan view of said member.

Referring to the drawings let A indicate the casing, B the valve insides or working parts, and C the foot usually provided with circular grooves D to assist in clamping the tire tube. The casing is formed with a circumferential groove E which reduces its proportion to less than that of the diameter of the body of the casing, the groove E being adapted for the reception of the edge of the opening in an inner tube through which the foot C of the valve casing is inserted. Within the lower end of the valve casing is a reinforcing member F preferably constructed of good quality of brass or steel or other metal of sufficient strength to assist the body of the casing to withstand the strains of use. The reinforcing member comprises a sleeve G provided on its exterior with ridges or corrugations H which is embedded in the casing and a flange I at the lower end thereof which preferably seats against the base of the foot C. It will be understood, however, that instead of the ridges or corrugations H the contour of the exterior of the sleeve may be such as to provide an interlocking engagement between said sleeve and the casing. As herein shown the flange I is seated Within a shallow depression in the head of the foot C and is flush with the top surface of said foot.

The reinforcing member F is preferably inserted during the casting process, the metal being cast around it and particularly around the roughened surface of the sleeve G. r

The provision of the flange I is most important since many of the strains encountered in use are breaking strains in which the foot C in som'emanner acts as a lever. By providing the flange I this action is opposed by metal of adequate strength to resist it.

While I have shown and described the preferred form of the invention it Will be understood that I do not wish to be limited thereto as various changes may be made therein Without departing from the spirit of the invention.

What I claim is:

1. A die cast valve casing having a body portion and an integral flange constituting a foot portion and a reinforcing member embedded in the lower end of the casing, said member having a part extending longitudinally of the casing and a part seating against the base of the flanged foot portion.

2. A die cast valve casing having a body portion and an integral flange constituting a foot portion and a reinforcing member embedded in the lower end of the casing, said member comprising atubular part having a ridged or corrugated exterior extending longitudinally of the casing and a lateral flange seating against the base of the flanged foot portion and flush therewith.

, 3. A die cast valve casing having'a body portion and foot portion of substantial thickness formed of an easily castable material and a reinforcing member at its foot end, said reinforcing member comprising a sleeve having a flange, the sleeve extending axially of the casing to a point slightly above the foot portion and located in the bore of the body portion. and the flange extending transversely of the sleeve and casing and extending along the foot portion of the easing.

at. A die cast valve casing having a body portion and a foot portion of substantial thickness formed of an easily oastable material and a reinforcing member at its foot end, said reinforcing member comprising a comparatively thin metallic sleeve having a flange, the sleeve extending axially of the casing to a point slightly above the foot portion and located in the bore of the body portion to lie flush therewith, and the flange extending transversely of the sleeve and casing and embedded in the foot portion of the casing.

In Witness whereof I have hereunto signed my name.

HENRY PHILLIP KRAFT. 

